feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

substrate/client/mixnet/src/protocol.rs

@@ -0,0 +1,73 @@
+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+use super::config::Config;
+use mixnet::core::PACKET_SIZE;
+use sc_network::{
+	config::{NonReservedPeerMode, SetConfig},
+	peer_store::PeerStoreProvider,
+	service::NotificationMetrics,
+	NetworkBackend, NotificationService, ProtocolName,
+};
+use sp_runtime::traits::Block as BlockT;
+
+/// Returns the protocol name to use for the mixnet controlled by the given chain.
+pub fn protocol_name(genesis_hash: &[u8], fork_id: Option<&str>) -> ProtocolName {
+	let name = if let Some(fork_id) = fork_id {
+		format!("/{}/{}/mixnet/1", array_bytes::bytes2hex("", genesis_hash), fork_id)
+	} else {
+		format!("/{}/mixnet/1", array_bytes::bytes2hex("", genesis_hash))
+	};
+	name.into()
+}
+
+/// Returns the peers set configuration for the mixnet protocol.
+pub fn peers_set_config<Block: BlockT, Network: NetworkBackend<Block, <Block as BlockT>::Hash>>(
+	name: ProtocolName,
+	config: &Config,
+	metrics: NotificationMetrics,
+	peerstore_handle: std::sync::Arc<dyn PeerStoreProvider>,
+) -> (Network::NotificationProtocolConfig, Box<dyn NotificationService>) {
+	let set_config = if config.substrate.num_gateway_slots != 0 {
+		// out_peers is always 0; we are only interested in connecting to mixnodes, which we do by
+		// setting them as reserved nodes
+		SetConfig {
+			in_peers: config.substrate.num_gateway_slots,
+			out_peers: 0,
+			reserved_nodes: Vec::new(),
+			non_reserved_mode: NonReservedPeerMode::Accept,
+		}
+	} else {
+		SetConfig {
+			in_peers: 0,
+			out_peers: 0,
+			reserved_nodes: Vec::new(),
+			non_reserved_mode: NonReservedPeerMode::Deny,
+		}
+	};
+
+	Network::notification_config(
+		name,
+		Vec::new(),
+		PACKET_SIZE as u64,
+		None,
+		set_config,
+		metrics,
+		peerstore_handle,
+	)
+}